如何在 Android Studio and/or gradle 中设置 NDK_MODULE_PATH？

Question

我正在将 Android 库从 Eclipse 迁移到 Android Studio。在 Eclipse 中，我可以通过 Project > Properties > Resource > Linked Resources > Path Variables 设置 NDK_MODULE_PATH。但是我如何在 Android Studio 中分别使用 gradle 实现同样的事情？

我的库一直在构建，直到它尝试为 NDK_MODULE_PATH 下的模块找到 headers。

错误信息如下：

Executing tasks: [:libAndroid:compileDebugSources, :physicaloidLibrary:compileDebugSources]

Configuration on demand is an incubating feature.
:libAndroid:preBuild UP-TO-DATE
:libAndroid:preDebugBuild UP-TO-DATE
:libAndroid:checkDebugManifest
:libAndroid:preDebugAndroidTestBuild UP-TO-DATE
:libAndroid:preReleaseBuild UP-TO-DATE
:physicaloidLibrary:compileLint
:physicaloidLibrary:copyReleaseLint UP-TO-DATE
:physicaloidLibrary:mergeReleaseProguardFiles UP-TO-DATE
:physicaloidLibrary:preBuild UP-TO-DATE
:physicaloidLibrary:preReleaseBuild UP-TO-DATE
:physicaloidLibrary:checkReleaseManifest
:physicaloidLibrary:prepareReleaseDependencies
:physicaloidLibrary:compileReleaseAidl UP-TO-DATE
:physicaloidLibrary:compileReleaseRenderscript UP-TO-DATE
:physicaloidLibrary:generateReleaseBuildConfig UP-TO-DATE
:physicaloidLibrary:generateReleaseAssets UP-TO-DATE
:physicaloidLibrary:mergeReleaseAssets UP-TO-DATE
:physicaloidLibrary:generateReleaseResValues UP-TO-DATE
:physicaloidLibrary:generateReleaseResources UP-TO-DATE
:physicaloidLibrary:packageReleaseResources UP-TO-DATE
:physicaloidLibrary:processReleaseManifest UP-TO-DATE
:physicaloidLibrary:processReleaseResources UP-TO-DATE
:physicaloidLibrary:generateReleaseSources UP-TO-DATE
:physicaloidLibrary:compileReleaseJava UP-TO-DATE
:physicaloidLibrary:processReleaseJavaRes UP-TO-DATE
:physicaloidLibrary:packageReleaseJar UP-TO-DATE
:physicaloidLibrary:compileReleaseNdk UP-TO-DATE
:physicaloidLibrary:packageReleaseJniLibs UP-TO-DATE
:physicaloidLibrary:packageReleaseLocalJar UP-TO-DATE
:physicaloidLibrary:packageReleaseRenderscript UP-TO-DATE
:physicaloidLibrary:bundleRelease UP-TO-DATE
:libAndroid:prepareLibAndroidGradlePhysicaloidLibraryUnspecifiedLibrary UP-TO-DATE
:libAndroid:prepareDebugDependencies
:libAndroid:compileDebugAidl UP-TO-DATE
:libAndroid:compileDebugRenderscript UP-TO-DATE
:libAndroid:generateDebugBuildConfig UP-TO-DATE
:libAndroid:generateDebugAssets UP-TO-DATE
:libAndroid:mergeDebugAssets UP-TO-DATE
:libAndroid:generateDebugResValues UP-TO-DATE
:libAndroid:generateDebugResources UP-TO-DATE
:libAndroid:mergeDebugResources UP-TO-DATE
:libAndroid:processDebugManifest UP-TO-DATE
:libAndroid:processDebugResources UP-TO-DATE
:libAndroid:generateDebugSources UP-TO-DATE
:libAndroid:compileDebugJava UP-TO-DATE
:libAndroid:compileDebugNdk
AGPBI: {"kind":"SIMPLE","text":"/home/rhodo/dev/android/studio/LibAndroidGradle/libAndroid/src/main/jni/imageprocessing/dmtxutil.c:30:18: fatal error: dmtx.h: No such file or directory","position":{},"original":"/home/rhodo/dev/android/studio/LibAndroidGradle/libAndroid/src/main/jni/imageprocessing/dmtxutil.c:30:18: fatal error: dmtx.h: No such file or directory"}
AGPBI: {"kind":"SIMPLE","text":" #include \u003cdmtx.h\u003e","position":{},"original":" #include \u003cdmtx.h\u003e"}
AGPBI: {"kind":"SIMPLE","text":"                  ^","position":{},"original":"                  ^"}
AGPBI: {"kind":"SIMPLE","text":"compilation terminated.","position":{},"original":"compilation terminated."}
AGPBI: {"kind":"SIMPLE","text":"make: *** [/home/rhodo/dev/android/studio/LibAndroidGradle/libAndroid/build/intermediates/ndk/debug/obj/local/arm64-v8a/objs/Rhodo//home/rhodo/dev/android/studio/LibAndroidGradle/libAndroid/src/main/jni/imageprocessing/dmtxutil.o] Error 1","position":{},"original":"make: *** [/home/rhodo/dev/android/studio/LibAndroidGradle/libAndroid/build/intermediates/ndk/debug/obj/local/arm64-v8a/objs/Rhodo//home/rhodo/dev/android/studio/LibAndroidGradle/libAndroid/src/main/jni/imageprocessing/dmtxutil.o] Error 1"}


 FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':libAndroid:compileDebugNdk'.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/opt/android-ndk/ndk-build'' finished with non-zero exit value 2

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 2.763 secs

对此有什么想法吗？

Answer 1

在 Android Studio 项目的根目录下，有一个名为 "local.properties" 的文件。添加一个名为 "ndk.dir" 的属性并将值设置为指向 ndk 的位置。类似于以下内容：

ndk.dir=/Users/username/sdk

我可能没理解你的问题。如果您已经设置了 ndk 的位置并且只是想确保构建了一个模块，那么将模块添加到 "settings.gradle" 文件。

include ":<your module name>"

然后确保将 C 代码放在模块中的 "src/main/jni" 中。 Gradle 会根据文件夹名称自动找到它。不再需要设置 NDK_MODULE_PATH.

Answer 2

使用：

Gradle版本：3.3
Android插件版本：com.android.tools.build:gradle:2.3.1

这对我有用：

android {

    ...

    defaultConfig {

        ...

        ndk {
            abiFilters 'armeabi', 'armeabi-v7a'
        }

        externalNativeBuild {
            ndkBuild {
                // TODO replace jniDependencies folder with the path to your modules
                arguments "NDK_MODULE_PATH:=${rootProject.projectDir}/jniDependencies"
            }
        }
    }

    externalNativeBuild {
        ndkBuild {
            path 'src/main/jni/Android.mk'
        }
    }


}

这样我就不需要将 NDK_MODULE_PATH 添加到我的 PATH 中来构建项目。然而，clean 任务失败了，因为它不会从这里获取参数，所以我需要添加另一个 hack 来解决这个问题：

tasks.withType(com.android.build.gradle.tasks.ExternalNativeCleanTask) {
    it.actions.clear()

    doLast {
        project.delete("${projectDir}/.externalNativeBuild")
    }
}

如何在 Android Studio and/or gradle 中设置 NDK_MODULE_PATH？

How to set NDK_MODULE_PATH in Android Studio and/or gradle?

android

android-ndk

android-studio

android-gradle-plugin